Abstract
This presentation describes investigation of a thick-wall spherical shell 48 mm in diameter from the alloy of uranium with molybdenum and zirconium, which survived after high-intensity explosive loading. Investigation was performed in the meridional section of the shell to obtain qualitative data on hardness and microhardness, metallurgical inclusions, damage, and also material microstructure. Structural changes are observed to widely present in the shell material. The localized damage observed both at R ≈ 12-14 mm and R ≈ 16-18 mm are the first and second converged spalls, respectively. What is more, in the southern sector the first spall was recompacted with the remelting of a large region of the material in the adjacent layers (region with the enhanced hardness for the first spall). Cracks of the second spall in the northern sector were also recompacted almost completely.
Highlights
Investigations into physical properties of a material subjected to high-speed intensive loading is of great interest, as far as in addition to fast compression of a material up to high pressures and its adiabatic heating-up, there are extremely high-speed processes of elastic-viscous-plastic deformation, polymorphous and phase transitions, and shear and spall fractures [1]
This presentation describes investigation of a thickwall spherical shell from the alloy of uranium with molybdenum and zirconium, which survived after highintensity explosive loading
Investigation was performed in the meridional section of the shell (Figure 1) to obtain qualitative data on hardness and microhardness, metallurgical inclusions, damage, and material microstructure
Summary
Investigations into physical properties of a material subjected to high-speed intensive loading is of great interest, as far as in addition to fast compression of a material up to high pressures and its adiabatic heating-up, there are extremely high-speed processes of elastic-viscous-plastic deformation, polymorphous and phase transitions, and shear and spall fractures [1]. Spherical explosive recovery experiments have certain advantages compared to the experiments in the plane and cylindrical geometries [2]: (i) the level of created short-term high pressures and temperatures and (ii) minimal secondary impacts during deceleration and trapping of the recovered samples. This presentation describes investigation of a thickwall spherical shell from the alloy of uranium with molybdenum and zirconium, which survived after highintensity explosive loading. The stress-deformed state of the shell material was studied through color mapping [5] of measured values of hardness and microhardness, i.e. the method previously used to study similar shells [3,4]
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